F09+Exam+2+(sample)

# F09+Exam+2+(sample) - ES 2120 Exam 2 Name 1 True/False...

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ES 2120 Exam 2 October 19, 2009 ________ 10 points Name: ______________________________________________________________________ 1) True/False Questions (2 points each). a. True or False : A force that acts on a particle in a direction perpendicular to the path on which the particle travels does no work on the particle. b. True or False : Momentum, like kinetic energy, is a scalar. c. True or False : A larger force will always produce a larger impulse on a body than does a smaller force. d. True or False : In a perfectly plastic collision between two bodies, the velocities of the bodies immediately after the collision are equal to the velocity of the center of mass of the system. e. True or False : The vector product of force and velocity is power. ________ 10 points 2) A 2000 kg cannon fires a 10 kg projectile horizontally at 600 m/s. It takes 0.007 s for the projectile to pass through the barrel. The cannon has a spring mechanism to absorb the recoil. Find: a) The cannon’s initial recoil velocity. b) The force exerted on the recoil spring.

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